patch 8.0.0796: no coverage on Travis with clang commit https://github.com/vim/vim/commit/d973bcb483088b69eb1aed3788476662fe6b77ef Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jul 28 18:01:58 2017 +0200 patch 8.0.0796: no coverage on Travis with clang Problem: No coverage on Travis with clang. Solution: Use a specific coveralls version. (Ozaki Kiichi, closes https://github.com/vim/vim/issues/1888)